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Workaround for a heinous vc7 bug

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[SVN r19414]
This commit is contained in:
Dave Abrahams
2003-08-03 11:48:55 +00:00
parent 6d3dae7102
commit 8065e071f7
1 changed files with 15 additions and 1 deletions
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16
include/boost/mpl/aux_/has_xxx.hpp
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@@ -70,14 +70,28 @@ namespace boost { namespace mpl { namespace aux {
struct has_xxx_tag;
# if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
template <class U>
struct msvc_incomplete_array
{
typedef char (&type)[sizeof(U) + 1];
};
# endif
template <typename T>
struct msvc_is_incomplete
{
// MSVC is capable of some kinds of SFINAE. If U is an incomplete
// type, it won't pick the second overload
static char tester(...);
# if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
template <class U>
static char(& tester(type_wrapper<U>) )[sizeof(U) + 1];
static typename msvc_incomplete_array<U>::type tester(type_wrapper<U>);
# else
template <class U>
static char (& tester(type_wrapper<U>) )[sizeof(U)+1];
# endif
BOOST_STATIC_CONSTANT(
bool, value = sizeof(tester(type_wrapper<T>())) == 1);